Terrorism: Commentary on Security Documents is a series that provides primary source documents and expert commentary on various topics relating to the worldwide effort to combat terrorism, as well as efforts by the United States and other nations to protect their national security interests. Volume 147, Assessing the 2017 U.S. National Security Strategy, evaluates the changes in U.S. national security policy indicated in the National Security Strategy published by the Trump administration in 2017, as well as the U.S. National Defense Strategy, a summary of which was made available to the public in 2018. The volume also takes a close look at the comparable strategy documents of the Russian Federation and the People's Republic of China (PRC), the two greatest competitors of the U.S. in the global power structure, in addition to considering the U.S. security posture in the broader international context. In addition to including the text of the 2017 U.S. National Security Strategy and the 2018 U.S. National Defense Strategy, this volume also includes the Russian Federation's Foreign Policy Concept, National Security Strategy, and Military Doctrine, and China's national defense, military strategy, and Asia-Pacific cooperation documents, as well as Chinese President Xi Jinping's October 2017 speech to the 19th National Congress of the Communist Party of China outlining the way forward for the PRC. Two 2017 CRS reports examining U.S. security strategy in the international context are also included: U.S. Role in the World: Background and Issues for Congress and A Shift in the International Security Environment: Potential Implications for Defense-Issues for Congress.